Auger



J. SWAN.

AUGER.

(No Model.)

* Patented June 12,1883.

A 3 5 just above the screw-point.

UNIT D A STATES PATENT OFFICE.

JAMES SWAN, OF SEYMOUR, CONNECTICUT.

AUGER.

' SPECIFICATION forming part of Iietters Patent No. 279,204, dated June 12, 1883. Application filed March 9, 188 3. (No model.)

To'aZZ whom it may concern Be it known that I, JAMEs SWAN, of Seymour, county of New Haven, State of Connecticut, have invented an Improvement in Angers or Auger-Bits, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention relates to improvements in straight and cylindrical, as represented in United States Patent No, 27,946, April 17, 1860; but such bits oraugers are objectionable, because they fail to eifectually remove the chips, and hence they cannot be used to bore other than shallow holes. To overcome this great objection to the use of this class of bit or anger, and produce one whereby a hole may be bored of any desired diameter within the capacity of the adjustable cutter, and also for any desired depth within the length of the body carrying the said cutter, I have twisted the body from the screw-point upward above the cutter, the said twist extending along the body for a distance substantially equal to the depth it is desired to bore the hole, acting to carry out from the hole the chips produced by the adjustable cutter and floor-lip of the bit, or that part of the bit where the twist starts,

For cheapness of construction, the body of the bit or anger is swaged or dropped in dies to form a seat for the adjustable cutter, which is made triangular in cross-section, and the said cutter is adj ustably held in the said seat by a beveled-faced cap held in position by a screw. To accompany my improved anger or bit and enable it to be used to bore a hole of a diameter the same as the body, I have provided an extra short cutter, it having a spur, and it will be noticed that the bit may be used to bore a hole without the aid of either of the adjustable cutters, for the floor and lip are made to constitute a gouge-lip.

Figure 1 represents my improved bit or anger in elevation; Fig. 2, a partial elevation of the same when turned one-fourth around; Fig. 3, a like view when turned one-half around. Fig. 4 is an end view, showing the gouge-lip and leading-screw; and Figs. 5 and 6 represent the lower end of the bit or anger, with the cutter and its holderor clamp removed; and Fig. 7 is adetail showing the bit adapted to bore a hole of substantially the same diameter as its body.

In the manufacture of my improved bit or anger I provide the same with a squared and rounded shank, a b, and below that the bodyof the same is twisted, as at c. As herein shown, the body has two spiral grooves, 2 3'. The groove 2 at its lower end constitutes the floor-lip, and is shaped to form a gouge, as shown at d, Figs. 3 and 4, and immediately beyond it is the terminal or leading screw 0. Near its lower end, and substantially at right angles thereto, between the floor 4 and the lower portion of the groove 3, the body is provided with aseat, 5, (shown best in Fig. 5,) for the reception of the adjustable cutter f, it being shown as triangular in cross-section and provided with a cutting-lip, 6., This adjustable cutter is held on the seat 5, above the floor 4, by means of a clamp or block, and a screw, 71. The groove 2wi1l take the chips produced by the gouge-shaped floor-lip d, and the groove 3 takes the chips formed by the adjustable cutter, each of the said grooves co-operating to liitthe chips from the hole being bored, so that the-said hole may be bored of any desired depth, determined only by the length of the twisted body. I

The body of the anger or bit might have a single twist, or one groove, and in such event the one groovewould be as the groove 2. One and two grooved or twisted bits being common, this modification will be readily understood, and such modification would be within the scope of my invention.

Should it be desired to bore a hole of only substantially the diameter of the twisted body,

. I should employ a short adjustable cutter-y-such as shownin Fig. 7 providing it with a spur,6, and by entirely removing the adjustable cut ter, leaving the end of the bit as in Fig. 5, the same maybe used as an ordinary gouge-lip bit.

In earlier forms of expansion-bits the guideways to receive the adjustable cutter have been formed by expensive processes of drill ing and milling, thus wasting stock and requiring expensive tools and experienced and skilled mechanics to run them; but in this my invention the seat for the adjustable cutter is quickly made by forging, thus niateriallycheap cning the construction of the same.

I olaim- 1. As an improved article of manufacture, an expansion bit or anger, it comprehending a twisted body provided with a cutting-lip at the lower end of one of its twists or grooves, a leading-screw, an adjustable cutter, a seat for the same, and a clamp to hold the cutter in adjusted position, all substantially as described.

2. In an expansion bit or an er, the twisted body provided at its lower end with the leading-serew, and having a transverse seat, 5, located above. the floor 4, combined with the ad- 20 justable cutter, and clamp to hold the said cutter in the seat, substantially as described, the grooves of the body acting to remove from the hole the chips made by the said cutter, substantially as set forth.

3. In an expansion bit or anger, the combination, substantially as shown and described, of the twisted body, the leading-screw at the lower end thereof, the transverse seat 5, arranged in the lower end of the body, above the floor 4 thereof, an adjustable cutter fitted in said seat, and means to hold said cutter in its seat. 1

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JAMES SXVAN.

Witnesses:

G. W. GREGORY, FRED A. POWELL. 

